said by Arne Bolen:
FYI there is also a "special" SIP address which rings your SIP device directly bypassing the Call Flow system.
XXXXXXXXXX = your account number
Thanks. That sounds worrisome. Somebody who knew my account number, including somebody who had the a SIP URI which starts with my account number, could ring in around my call flow filtering.
Is there such a thing as having your own SIP server where you would have something like firstname.lastname@example.org, where 184.108.40.206 is your IP number